:root {
	/* Dark theme color palette */
	--bg-color: #0f172a;
	--bg-secondary: #1e293b;
	--bg-gradient: linear-gradient(135deg, #1e3a8a 0%, #3730a3 100%);
	--surface: #1e293b;
	--surface-elevated: #334155;
	--surface-hover: #475569;
	--primary: #60a5fa;
	--primary-dark: #3b82f6;
	--primary-light: #93c5fd;
	--secondary: #a78bfa;
	--accent: #22d3ee;
	--text-primary: #f1f5f9;
	--text-secondary: #cbd5e1;
	--text-muted: #94a3b8;
	--border: #334155;
	--border-hover: #475569;
	--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
	--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
	--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
	--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
	--radius: 8px;
	--radius-lg: 12px;
	--radius-xl: 16px;
	
	/* Dark theme specific variables */
	--glass-bg: rgba(30, 41, 59, 0.8);
	--glass-border: rgba(148, 163, 184, 0.1);
	--overlay: rgba(0, 0, 0, 0.6);
	--success: #10b981;
	--success-bg: rgba(16, 185, 129, 0.1);
	--success-border: rgba(16, 185, 129, 0.3);
	--warning: #f59e0b;
	--warning-bg: rgba(245, 158, 11, 0.1);
	--warning-border: rgba(245, 158, 11, 0.3);
	--error: #ef4444;
	--error-bg: rgba(239, 68, 68, 0.1);
	--error-border: rgba(239, 68, 68, 0.3);
}

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

html {
	font-size: 16px;
	scroll-behavior: smooth;
}

body {
	font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
	font-size: 1rem;
	font-weight: 400;
	line-height: 1.6;
	color: var(--text-primary);
	background: var(--bg-color);
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

/* Links */
a {
	color: var(--primary);
	text-decoration: none;
	transition: all 0.2s ease;
}

a:hover {
	color: var(--primary-light);
	text-decoration: underline;
}

/* Modern Navigation */
nav {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 1000;
	background: var(--glass-bg);
	backdrop-filter: blur(20px);
	-webkit-backdrop-filter: blur(20px);
	border-bottom: 1px solid var(--border);
	padding: 0 1rem;
	box-shadow: var(--shadow-sm);
	transition: all 0.3s ease;
}

nav > a {
	display: inline-flex;
	align-items: center;
	padding: 1rem 1.5rem;
	color: var(--text-primary);
	text-decoration: none;
	font-weight: 500;
	transition: all 0.2s ease;
	position: relative;
	border-radius: var(--radius);
	margin: 0.5rem 0.25rem;
}

nav > a:first-child {
	font-weight: 700;
	color: var(--primary);
}

nav > a:hover {
	background: var(--surface-hover);
	color: var(--primary);
	transform: translateY(-1px);
}

nav > a::after {
	content: '';
	position: absolute;
	bottom: 0;
	left: 50%;
	width: 0;
	height: 2px;
	background: var(--primary);
	transition: all 0.3s ease;
	transform: translateX(-50%);
}

nav > a:hover::after {
	width: 80%;
}

/* Navigation scroll state */
nav.nav-scrolled {
	background: rgba(30, 41, 59, 0.95) !important;
	backdrop-filter: blur(20px) !important;
	-webkit-backdrop-filter: blur(20px) !important;
	box-shadow: var(--shadow-md) !important;
}

/* Main Content Area */
#content {
	margin-top: 5rem;
	min-height: calc(100vh - 10rem);
	padding: 2rem 1rem;
	max-width: 1200px;
	margin-left: auto;
	margin-right: auto;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
	font-weight: 700;
	line-height: 1.2;
	margin-bottom: 1rem;
	color: var(--text-primary);
}

h1 {
	font-size: 2.5rem;
	background: var(--surface);
	padding: 2rem;
	border-radius: var(--radius-lg);
	box-shadow: var(--shadow-md);
	border: 1px solid var(--border);
	position: relative;
	overflow: hidden;
}

h1::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	height: 4px;
	background: var(--bg-gradient);
}

h2 {
	font-size: 2rem;
}

h3 {
	font-size: 1.5rem;
}

/* Modern Cards/Blocks */
#content > div, .block, .card {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius-lg);
	padding: 2rem;
	margin-bottom: 2rem;
	box-shadow: var(--shadow-md);
	transition: all 0.3s ease;
	position: relative;
	overflow: hidden;
}

#content > div:hover, .block:hover, .card:hover {
	box-shadow: var(--shadow-lg);
	border-color: var(--border-hover);
}

/* Modern Forms */
form {
	max-width: 600px;
	margin: 0 auto;
}

form > div {
	display: flex;
	flex-direction: column;
	margin-bottom: 1.5rem;
	gap: 0.5rem;
}

form > div > label {
	font-weight: 500;
	color: var(--text-secondary);
	font-size: 0.875rem;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	transition: all 0.2s ease;
}

form > div > input, form > div > textarea, form > div > select {
	padding: 0.75rem 1rem;
	border: 2px solid var(--border);
	border-radius: var(--radius);
	background: var(--bg-secondary);
	color: var(--text-primary);
	font-size: 1rem;
	transition: all 0.2s ease;
}

form > div > input:focus, form > div > textarea:focus, form > div > select:focus {
	outline: none;
	border-color: var(--primary);
	box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.2);
	background: var(--surface);
}

/* Enhanced form validation states */
form > div > input.valid, form > div > textarea.valid {
	border-color: var(--success);
	box-shadow: 0 0 0 3px var(--success-bg);
}

form > div > input.invalid, form > div > textarea.invalid {
	border-color: var(--error);
	box-shadow: 0 0 0 3px var(--error-bg);
}

/* Floating label effect */
form > div.focused > label {
	transform: translateY(-0.5rem) scale(0.85);
	color: var(--primary);
}

/* Modern Buttons */
button, .btn, form > div > input[type=submit], input[type="submit"] {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.75rem 1.5rem;
	background: var(--primary);
	color: var(--bg-color);
	border: none;
	border-radius: var(--radius);
	font-weight: 500;
	font-size: 1rem;
	cursor: pointer;
	transition: all 0.2s ease;
	text-decoration: none;
	position: relative;
	overflow: hidden;
}

button:hover, .btn:hover, form > div > input[type=submit]:hover, input[type="submit"]:hover {
	background: var(--primary-dark);
	transform: translateY(-1px);
	box-shadow: var(--shadow-lg);
}

button:active, .btn:active {
	transform: translateY(0);
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg-color);
    outline: none;
    border-radius: 3px;
    -webkit-appearance: none;
    appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary);
    cursor: pointer;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary);
    cursor: pointer;
    border-radius: 50%;
    border: none;
    box-shadow: var(--shadow-sm);
}

/* Button variants */
.btn-secondary {
	background: var(--secondary);
}

.btn-secondary:hover {
	background: #8b5cf6;
}

.btn-outline {
	background: transparent;
	color: var(--primary);
	border: 2px solid var(--primary);
}

.btn-outline:hover {
	background: var(--primary);
	color: var(--bg-color);
}

.btn-large {
	padding: 1rem 2rem;
	font-size: 1.125rem;
}

/* Utility Classes */
.banner {
	padding: 1rem 1.5rem;
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	margin-bottom: 1rem;
}

.banner.success {
	background: var(--success-bg);
	border-color: var(--success-border);
	color: var(--success);
}

.banner.warning {
	background: var(--warning-bg);
	border-color: var(--warning-border);
	color: var(--warning);
}

.banner.error {
	background: var(--error-bg);
	border-color: var(--error-border);
	color: var(--error);
}

.error {
	color: var(--error);
}

/* Footer */
footer {
	text-align: center;
	color: var(--text-muted);
	padding: 2rem 1rem;
	margin-top: 4rem;
	border-top: 1px solid var(--border);
	background: var(--surface);
}

/* Mobile Responsive Design */
@media (max-width: 768px) {
	nav {
		padding: 0 0.5rem;
		overflow-x: auto;
		white-space: nowrap;
		scrollbar-width: none;
		-ms-overflow-style: none;
	}
	
	nav::-webkit-scrollbar {
		display: none;
	}
	
	nav > a {
		padding: 0.75rem 1rem;
		margin: 0.25rem 0.125rem;
		font-size: 0.875rem;
		display: inline-flex;
		flex-shrink: 0;
	}
	
	#content {
		margin-top: 4rem;
		padding: 1rem 0.5rem;
	}
	
	h1 {
		font-size: 1.875rem;
		padding: 1.5rem;
	}
	
	#content > div, .block, .card {
		padding: 1.5rem;
		margin-bottom: 1rem;
	}
	
	form > div {
		margin-bottom: 1rem;
	}
	
	button, .btn {
		padding: 0.875rem 1.25rem;
		font-size: 0.9rem;
	}
}

@media (max-width: 480px) {
	nav > a {
		padding: 0.5rem 0.75rem;
		font-size: 0.8rem;
	}
	
	#content {
		padding: 1rem 0.25rem;
	}
	
	h1 {
		font-size: 1.5rem;
		padding: 1rem;
	}
	
	#content > div, .block, .card {
		padding: 1rem;
		border-radius: var(--radius);
	}
}

/* Smooth scrolling and improved animations */
* {
	scroll-behavior: smooth;
}

/* Loading animation for better perceived performance */
@keyframes pulse {
	0%, 100% { opacity: 1; }
	50% { opacity: 0.5; }
}

.loading {
	animation: pulse 2s ease-in-out infinite;
}

/* Focus states for accessibility */
button:focus, .btn:focus, input:focus, textarea:focus, select:focus {
	outline: 2px solid var(--primary);
	outline-offset: 2px;
}

/* Print styles */
@media print {
	nav, footer, .cta-section {
		display: none;
	}
	
	#content {
		margin-top: 0;
	}
	
	* {
		background: white !important;
		color: black !important;
		box-shadow: none !important;
	}
}